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From: Greg KH on 22 Apr 2010 16:30
2.6.33-stable review patch. If anyone has any objections, please let us know.

------------------

From: Daniel T Chen <crimsun(a)ubuntu.com>

commit b8e80cf386419453678b01bef830f53445ebb15d upstream.

BugLink: https://launchpad.net/bugs/551606

The OR's hardware distorts at PCM 100% because it does not correspond to
0 dB. Fix this in patch_ad1981() for all models using the Thinkpad
quirk.

Reported-by: Jane Silber
Signed-off-by: Daniel T Chen <crimsun(a)ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai(a)suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
sound/pci/hda/patch_analog.c | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -1805,6 +1805,14 @@ static int patch_ad1981(struct hda_codec
case AD1981_THINKPAD:
spec->mixers[0] = ad1981_thinkpad_mixers;
spec->input_mux = &ad1981_thinkpad_capture_source;
+ /* set the upper-limit for mixer amp to 0dB for avoiding the
+ * possible damage by overloading
+ */
+ snd_hda_override_amp_caps(codec, 0x11, HDA_INPUT,
+ (0x17 << AC_AMPCAP_OFFSET_SHIFT) |
+ (0x17 << AC_AMPCAP_NUM_STEPS_SHIFT) |
+ (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
+ (1 << AC_AMPCAP_MUTE_SHIFT));
break;
case AD1981_TOSHIBA:
spec->mixers[0] = ad1981_hp_mixers;


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